GM 8L45 transmission
The 8L45 is an eight-speed automatic transmission built by General Motors Company debuting in the 2016 Cadillac CT6. It is designed for use in longitudinal engine applications attached to the front-located engine[1] with a standard bell housing. It is a hydraulic (hydramatic) design sharing much with the 8L90 transmission.[2] Estimated weight savings over the heavier duty 8L90 is 33 pounds. Gear ratios used enable a wide 7.0 ratio spread.
| 8L45 | |
|---|---|
| Overview | |
| Manufacturer | General Motors |
| Production | 2016– |
| Body and chassis | |
| Class | 8-speed longitudinal automatic transmission |
| Chronology | |
| Predecessor | 6L45/6L50 |
Specifications
| Gear Teeth and Ratios | Planetary Gearset: Teeth | Count | Total | Avg. | |||||
|---|---|---|---|---|---|---|---|---|---|
| Model
Type |
Version
First Delivery |
Sun 1
Ring 1 |
Sun 2
Ring 2 |
Sun 3
Ring 3 |
Sun 4
Ring 4 |
Brakes
Clutches |
Ratio
Span |
Gear
Step | |
| Gear | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | R |
| 8L45
M5T |
2015 | 41
79 |
41
79 |
41
79 |
26
94 |
2
3 |
7.0107 | 1.3208 | |
| Ratio | 4.6154 | 3.0385 | 2.0648 | 1.6583 | 1.2587 | 1.0000 | 0.8494 | 0.6583 | - 3.9278 |
| 8L90
M5U |
860 Nm · 635 lb·ft[3]
2014 |
41[4]
79 |
46
86 |
37
73 |
25
89 |
2
3 |
6.9991 | 1.3204 | |
| Ratio | 4.5600 | 2.9709 | 2.0751 | 1.6876 | 1.2700 | 1.0000 | 0.8455 | 0.6515 | - 3.8176 |
Applications
| Model Years | Make and Model | Final Drive Ratio |
|---|---|---|
| 2016–present | Cadillac ATS | |
| 2016–present | Cadillac CTS | |
| 2016–present | Cadillac CT6 | |
| 2016–present | Chevrolet Camaro | |
| 2017–present | Chevrolet Colorado | |
| GMC Canyon |
References
- "USA Information Guide Model Year 2018" (PDF). Retrieved 15 July 2019.
- "Cadillac Introduces New 8-Speed Automatic on CT6". Cadillac Media USA. Cadillac Media USA. Retrieved 20 March 2015.
- "Transmission Repair Cost Guide". Retrieved 15 July 2019.
- "WIT · Whatever It Takes · Automatic Transmission Parts Catalog 2018+2019 Page 268". Retrieved 15 July 2019.
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